Detector finger and tip



June 29,1943. A CEDERLUND 2,322,828

DETECTOR FINGER AND TIP,

Filed Jan. 11, 1943 luvcu'roa ALBERT CEDERLUND ATTORNEY Patented June 29, 1943 DETECTOR FINGER AND TIP Albert Cederlund; Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application January 11, 1943; .Serial No. 471,994

7 Claims.

readily removedfromthe finger when. renewal is necessary.

Weft detectors of th side slipping type. generally employ a finger or arm having a feeler tip to engage the weft. It is customary to provide some'formof indentations or the like which will penetrate a suflicient supply of weft to prevent slipping of the detector arm but which will slide along the barebobbin when weft is exhausted.

Coil'springshave' heretofore been proposed for use as detector tips but they have been madein suohawaythat-they caneither turn to expose the ends of the springs to cause: entanglement of the weft; or have required anexpensive-form of mounting: Itis an important object of my pres ent' invention to provide-a detector tip of the spring type so constructed that the spring is held against rotation with its ends guarded so that they cannot engage the weft.

It'is a furtherobject of my present invention to providethe' detector armwith a slot across which extends a bridge so constructed that the spring can be threadedover a portion of the detector finger to enter the slot due to the relationship betweenthecoils of the spring and that part of .the finger atthe end of the slot.

Itis another object of my present invention to provide a' spring feeler tip having. at least one end thereof straightened to provide a prong for entry into a small aperture in the detector finger, the. prong and detector finger cooperating to prevent the spring tip from turning on the aforesaid bridge.

Another object of my invention is to provide a spring form of feeler tip in which the resilience of the springserves to hold the prong in holding relation with respect to the detector finger.

With these and other objects in view which will appear as the description proceeds, my invention.

resides in the combination and-arrangement of parts hereinafter described and-set forth.

In the accompanying drawing, whereinaa convenient embodiment of my invention-is set forth,

Fig. 1 isa plan view of a lay, shuttle box and.

shuttle, and a side slip weft detector provided with a finger and tip made according to my present invention,

Fig; 2- is an enlarged plan view ofthe detector finger and the tip shown in Fig; 1,

Figs; Sandi are enlarged detail vertical sec tions on lines 3-3 and 4-4,. respectively, of Fig. 2, and

Fig. 5 is a view similar: to aportion ofFig. 2 butshowing the manner in which the springtip can be applied to and removed from a detector finger;

Referring tothe drawing, I have shown a lay L having a shuttle box B containinga shuttle S provided with a supply of weft W mounted on the usual bobbin Ill. The binder H for the shuttle is pivoted to the lay as at l2 and has therein a horizontal slot I3 aligningwith a similar slot M in the front wall of the shuttle. A support [5 has mounted'thereon a weft detector D of the side slipping type provided with arearwardly extending diagonal detector finger it. As the lay reciprocates back andforth the Weft in the shuttle is presented to the-detector and when sufficient weft is present no change in loom operation ocours, but when the weft is exhausted the detector will operate in well-knownmanner to effect any one of the usual controls, such as bobbin or changing; or loom stoppage.

The matter thus far described is of common construction and is set forth herein for the" purpose of illustrating a convenient setting for my invention. I do not wish to be limited to the specific relationship shown in'Fig; l for the manper in which my inventionmay be used;

In-carrying my invention into effect I formthedetector'finger 16 of flat sheetmetal as suggested in Figs; 3and 4 and form a head 20 on the rear end thereof. A closed vertical transverse slot 2| extending generally in the direction of the length of the shuttle is'located within the head and has the end thereof defined by right and left hand walls 22 and 23, respectively, while" the rear side of the slot is closed by a bridge 24.

The detector tip is formed of a coil spring 30 at least one end of which is straightened to form a prong 3! extending generally inthe direction of the length of the slot 2|. Thewall 23 is provided' with a small hole 3'2'extending therethrough and communicating with:the slot 2! andproportioned to receive the prong 3|. The spring is preferably slightly longer than-the lengthofthe slot, but I have found that this is not an essentialrelation so long as the spring is of sufficient length to act by its resilience to hold the prong 3| in the hole 32.

When assembling the tip the right end 35 thereof as viewed in Fig. 5 maybe sprung over thewall 23 to enter the slot 2| andthe spring is then turned-to cause it to feed. along. the bridge 24 until the last coil on whichthe prong 3 I is formed operation of the detector, but when the weft is depleted the spring slides along bobbin ID to effect a change in loom operation, as already mentioned.

The thread from the delivery eye E of the shuttle extends between the front wall of the latter and the binder H and should lie below the detector tip. It occasionally happens that the thread will be high in the shuttle box and slide along the top or bottom surface of the detector finger l6 when the latter enters the shuttle for a detecting operation. Any projection extending above or below the top or bottom surfaces of the detector finger 16 will therefore cause entanglement of the thread with possible breakage. It will be seen by referring particularly to Figs. 3 and 4 that the surfaces which the weft can engage are all smooth or rounded and that the end 35 is guarded by its-location within the slot 2!, while the prong 3! is received by the opening 32 in the wall 33. Both ends of the spring are therefore held in such position that they cannot engage and entangle the thread and are held in this position due to the fact that the resilience of th spring holds the prong in hole 32 and thus prevents rotation of the spring around the bridge.

I have shown the prong on one 'end only of the spring and likewise have shown a prong receiving hole in only one of the side walls, namely wall 23, but I do not wish to be thus limited. Whatever the form of the spring tip, its coils will be spaced sufficiently to permit enough compression to allow the prong to enter the hole 32 from the side thereof which opens into the slot 2|.

From the foregoing it will be seen that Ihave provided a simple form of detector tip made of a coil spring having at least one end thereof formed with a prong to enter a part of the detector finger for the purpose of preventing the spring from rotating. It will also be seen that the end 35 of the spring will be held within the slot 2! due to the fact that the spring cannot turn around the bridge 24 as an axis. Furthermore, the spring can be conveniently assembled as indicated in Fig. 5,'and can "be removed for renewal by a reverse operation, the spring being compressed by movement to the right, Fig. 5, to remove the prong 3'! from the hole 32, after which the spring can be turned for unthreading over the wall 23.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled inthe art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. A weft detector finger having therein a laterally extending'recess located between spaced side walls on said finger, one of said walls having an opening therein, bridge means defining the outer end of said recess and extending from each side wall toward the other wall, and a detector tip comprising a resilient coil spring located between said walls and guided on said bridge means, one end of said spring having a prong thereon projecting into said opening to prevent turning of the spring on said bridge means.

2. A weft detector finger comprising a body from which spaced side walls project rearwardly, bridge means connected to each side wall and defining the outer end of said recess, one of said side walls having an opening therein, and a tip comprising a resilient coil spring surrounding said bridge means and having an end thereof straightened to form a prong to enter said opening and be held therein by the resilience of said spring to prevent turning of the spring with respect to said bridge means.

3. A sheet metal weft detector finger having spaced rearwardly extending side walls, bridge means defining the outer end of said recess and extending from each side wall toward the other wall, one of said side Walls having an opening therein, and a detector tip comprising-a resilient coil spring extending around said bridge means and having one end thereof formed as a prong to enter and be held in said opening by the resilience of the spring to maintain the other end of the spring in a position between the planes of the top and bottom surfaces of the finger.

4. A weft detector finger having spaced rearwardly extending walls one of which has an opening therein, bridge means extending from each wall toward the other wall, and-a "coiled' spring detector tip on said bridge means-having a prong at one end to enter said opening to cooperate with said one wall to hold the spring against rotation on said bridge means and with the other end of said spring in front of said bridgemeans.

5. A weft detector finger comprising a body having a 'closed'vertical slot therein so formed as to provide side walls'and a rear bridge'behind the slot on said finger, and a resilient coil spring surrounding said bridge and having the coils thereof projecting behind the rear surface of the bridge, one end of said spring being formed as a prong and one of said walls having an opening therein communicating with-said slot to receive theprong to prevent rotation of the spring around said bridge.

6. A weft detector finger comprising a body having a closed vertical slot therein so formed as to provide the finger with lateral wallsand;

a rear bridge behind said slot, and a resilient coil spring surrounding said bridge and having one end thereof terminating between the top and bottom of said slot and having the other end thereof bent to form a, projecting prong, one of said walls having an opening to receive said prong and said one wall'and prong cooperatingto prevent the spring from turning on thebridge and cooperating to maintain the first named end of the spring between the top and bottom ends of the slot. k v

7. A weft detector finger having. a vertical closed slot extending through the rear end thereof so formed asto provide side walls and a bridge connecting said walls, and a feeler tip comprising a resilient coil spring surrounding said bridge, one of said walls having an opening therein communicating with the slot and an end of said spring being formed as a prong to enter said opening to prevent turning of the spring on'said bridge, the wall opposite said wall having the opening therein engaging the end of the spring opposite the end formed with a prong to assist the spring by the resilience thereof to hold said 

